/* http://github.com/mindmup/bootstrap-wysiwyg */
/*global jQuery, $, FileReader*/
/*jslint browser:true*/
jQuery(function ($) {
    'use strict';
    var readFileIntoDataUrl = function (fileInfo) {
        var loader = $.Deferred(),
			fReader = new FileReader();
        fReader.onload = function (e) {
            loader.resolve(e.target.result);
        };
        fReader.onerror = loader.reject;
        fReader.onprogress = loader.notify;
        fReader.readAsDataURL(fileInfo);
        return loader.promise();
    };
    $.fn.cleanHtml = function () {
        var html = $(this).html();
        return html && html.replace(/(<br>|\s|<div><br><\/div>|&nbsp;)*$/, '');
    };
    $.fn.wysiwyg = function (userOptions) {
        var editor = this,
			selectedRange,
			options,
			updateToolbar = function () {
			    if (options.activeToolbarClass) {
			        $(options.toolbarSelector).find('.btn[data-' + options.commandRole + ']').each(function () {
			            var command = $(this).data(options.commandRole);
			            if (document.queryCommandState(command)) {
			                $(this).addClass(options.activeToolbarClass);
			            } else {
			                $(this).removeClass(options.activeToolbarClass);
			            }
			        });
			    }
			},
			execCommand = function (commandWithArgs, valueArg) {
			    var commandArr = commandWithArgs.split(' '),
					command = commandArr.shift(),
					args = commandArr.join(' ') + (valueArg || '');
			    document.execCommand(command, 0, args);
			    updateToolbar();
			},
			bindHotkeys = function (hotKeys) {
			    $.each(hotKeys, function (hotkey, command) {
			        editor.keydown(hotkey, function (e) {
			            if (editor.attr('contenteditable') && editor.is(':visible')) {
			                e.preventDefault();
			                e.stopPropagation();
			                execCommand(command);
			            }
			        }).keyup(hotkey, function (e) {
			            if (editor.attr('contenteditable') && editor.is(':visible')) {
			                e.preventDefault();
			                e.stopPropagation();
			            }
			        });
			    });
			},
			getCurrentRange = function () {
			    var sel = window.getSelection();
			    if (sel.getRangeAt && sel.rangeCount) {
			        return sel.getRangeAt(0);
			    }
			},
			saveSelection = function () {
			    selectedRange = getCurrentRange();
			},
			restoreSelection = function () {
			    var selection = window.getSelection();
			    if (selectedRange) {
			        try {
			            selection.removeAllRanges();
			        } catch (ex) {
			            var textRange = document.body.createTextRange();
			            textRange.select();
			            document.selection.empty();
			        }

			        selection.addRange(selectedRange);
			    }
			},
			insertFiles = function (files) {
			    editor.focus();
			    $.each(files, function (idx, fileInfo) {
			        if (/^image\//.test(fileInfo.type)) {
			            $.when(readFileIntoDataUrl(fileInfo)).done(function (dataUrl) {
			                execCommand('insertimage', dataUrl);
			            });
			        }
			    });
			},
			markSelection = function (input, color) {
			    restoreSelection();
			    document.execCommand('hiliteColor', 0, color || 'transparent');
			    saveSelection();
			    input.data(options.selectionMarker, color);
			},
			bindToolbar = function (toolbar, options) {
			    toolbar.find('a[data-' + options.commandRole + ']').click(function () {
			        restoreSelection();
			        editor.focus();
			        execCommand($(this).data(options.commandRole));
			        saveSelection();
			    });
			    toolbar.find('[data-toggle=dropdown]').click(restoreSelection);

			    toolbar.find('input[type=text][data-' + options.commandRole + ']').on('webkitspeechchange change', function () {
			        var newValue = this.value; /* ugly but prevents fake double-calls due to selection restoration */
			        this.value = '';
			        restoreSelection();
			        if (newValue) {
			            editor.focus();
			            execCommand($(this).data(options.commandRole), newValue);
			        }
			        saveSelection();
			    }).on('focus', function () {
			        var input = $(this);
			        if (!input.data(options.selectionMarker)) {
			            markSelection(input, options.selectionColor);
			            input.focus();
			        }
			    }).on('blur', function () {
			        var input = $(this);
			        if (input.data(options.selectionMarker)) {
			            markSelection(input, false);
			        }
			    });
			    toolbar.find('input[type=file][data-' + options.commandRole + ']').change(function () {
			        restoreSelection();
			        if (this.type === 'file' && this.files && this.files.length > 0) {
			            insertFiles(this.files);
			        }
			        saveSelection();
			        this.value = '';
			    });
			},
			initFileDrops = function () {
			    editor.on('dragenter dragover', false)
					.on('drop', function (e) {
					    var dataTransfer = e.originalEvent.dataTransfer;
					    e.stopPropagation();
					    e.preventDefault();
					    if (dataTransfer && dataTransfer.files && dataTransfer.files.length > 0) {
					        insertFiles(dataTransfer.files);
					    }
					});
			};
        options = $.extend({}, $.fn.wysiwyg.defaults, userOptions);
        bindHotkeys(options.hotKeys);
        initFileDrops();
        bindToolbar($(options.toolbarSelector), options);
        editor.attr('contenteditable', true)
			.on('mouseup keyup mouseout', function () {
			    saveSelection();
			    updateToolbar();
			});
        $(window).bind('touchend', function (e) {
            var isInside = (editor.is(e.target) || editor.has(e.target).length > 0),
				currentRange = getCurrentRange(),
				clear = currentRange && (currentRange.startContainer === currentRange.endContainer && currentRange.startOffset === currentRange.endOffset);
            if (!clear || isInside) {
                saveSelection();
                updateToolbar();
            }
        });
        return this;
    };
    $.fn.wysiwyg.defaults = {
        hotKeys: {
            'ctrl+b meta+b': 'bold',
            'ctrl+i meta+i': 'italic',
            'ctrl+u meta+u': 'underline',
            'ctrl+z meta+z': 'undo',
            'ctrl+y meta+y meta+shift+z': 'redo',
            'ctrl+l meta+l': 'justifyleft',
            'ctrl+r meta+r': 'justifyright',
            'ctrl+e meta+e': 'justifycenter',
            'ctrl+j meta+j': 'justifyfull',
            'shift+tab': 'outdent',
            'tab': 'indent'
        },
        toolbarSelector: '[data-role=editor-toolbar]',
        commandRole: 'edit',
        activeToolbarClass: 'btn-info',
        selectionMarker: 'edit-focus-marker',
        selectionColor: 'darkgrey'
    };
});
